How to get the Index of Specified Item in a Vector in Rust - Step by Step Examples

How to get the Index of Specified Item in a Vector in Rust ?

Answer

To get the index of a specified item in a vector in Rust, you can use the iter() method along with position() or enumerate().

✐ Examples

1 Find Index of Specified Item in Numeric Vector

In this example,

We have a vector named vec containing numeric elements.
We call the iter() method on vec to obtain an iterator.
We use the position() method on the iterator to find the index of the specified item.
Finally, we print the index to standard output.

Rust Program

fn main() {
    let vec = vec![1, 2, 3, 4, 5];
    let item = 3;
    let index = vec.iter().position(|&x| x == item);
    println!("{:?}", index);
}

Output

Some(2)

2 Find Index of Specified Item in String Vector

In this example,

We have a vector named vec containing string elements.
We call the iter() method on vec to obtain an iterator.
We use the enumerate() method on the iterator to find the index of the specified item.
Finally, we print the index to standard output.

Rust Program

fn main() {
    let vec = vec!["apple", "banana", "cherry", "date"];
    let item = "banana";
    let index = vec.iter().position(|&x| x == item);
    println!("{:?}", index);
}

Output

Some(1)

Summary

In this tutorial, we learned How to get the Index of Specified Item in a Vector in Rust language with well detailed examples.

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How to get the Index of Specified Item in a Vector in Rust - Step by Step Examples

How to get the Index of Specified Item in a Vector in Rust ?

Answer

✐ Examples

1 Find Index of Specified Item in Numeric Vector

Rust Program

Output

2 Find Index of Specified Item in String Vector

Rust Program

Output

Summary

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